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 / Public Works / Storm/Surface Water Program / Watershed-based Stormwater Retrofit Plan & Pre-design / Identifying Potential Retrofit Projects

Identifying Potential Retrofit Projects

The project team developed a detailed database of catchments and stormwater facilities using geographic information system (GIS), collected geologic and geotechnical data necessary to understand the movement of groundwater and infiltration feasibility in the study area as well as the stability/susceptibility of ravines, identified and prioritized (based on a number of criteria) project retrofits, and performed predesign on three selected projects. After potential sites were identified, the project team visited them to consider which of three types of low-impact development (LID) facility - bioretention swales and planters, pervious pavement, or detention pond retrofit - would be the most feasible and effective for each site.  The conclusion was a pond retrofit would work best at the Staybridge site and bioretention swales would work best at the middle school and 55th Place W. sites.  The Pre-Design Report (link to PDF) summarizes the pre-design analysis, including rationale for selecting the project, and presents a conceptual design and planning-level cost estimate for each site.
Based on the Mukilteo Stormwater Retrofit Project Identification and Prioritization Report developed during this project and in support of the pre-design, the three top-rated projects for pre-design are the following: 
  • Site 1 - Staybridge Suites Pond: retrofit existing detention pond to increase storage and decrease peak discharge
  • Site 2 - Harbour Pointe Middle School: construct bioretention swale to manage runoff in this catchment
  • Site 3 - 55th Place W/127th Street SW: construct bioretention swale to improve water quality and reduce peak flows currently entering two undersized detention ponds and wetlands
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